EP3623448A1 - Procédé pour traiter une matière luminescente comprenant des ligands organiques - Google Patents

Procédé pour traiter une matière luminescente comprenant des ligands organiques Download PDF

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Publication number
EP3623448A1
EP3623448A1 EP18194532.0A EP18194532A EP3623448A1 EP 3623448 A1 EP3623448 A1 EP 3623448A1 EP 18194532 A EP18194532 A EP 18194532A EP 3623448 A1 EP3623448 A1 EP 3623448A1
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EP
European Patent Office
Prior art keywords
luminescent material
systems
organic ligands
nanoparticles
solution
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EP18194532.0A
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German (de)
English (en)
Inventor
Marie Anne VAN DE HAAR
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Seaborough IP I BV
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Seaborough IP I BV
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Priority to EP18194532.0A priority Critical patent/EP3623448A1/fr
Priority to PCT/EP2019/074572 priority patent/WO2020053429A2/fr
Priority to EP19769149.6A priority patent/EP3850058A2/fr
Publication of EP3623448A1 publication Critical patent/EP3623448A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7774—Aluminates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7777—Phosphates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/18—Light sources with substantially two-dimensional radiating surfaces characterised by the nature or concentration of the activator

Definitions

  • the invention relates to a method for treating a luminescent material comprising organic ligands.
  • the invention also relates to a luminescent material obtainable by the method according to the invention.
  • Luminescent materials for instance if in the form of nanoparticles, may comprise organic ligands. Nanoparticles are most often synthesized in solution, wherein the growth and final size can be controlled. To prevent clustering during or after synthesis and to have additional means to control the growth, it is very common to bind 'organic ligands' or 'capping molecules' to the surface of the nanoparticles. These are organic molecules, that either by their electrostatic charge or just by their 'bulkiness', or by a combination of these, prevent clustering of the particles.
  • a less-selective known method is to use acids, like HCl (typically around 0.1M) to remove the organic ligands.
  • acids like HCl (typically around 0.1M)
  • HCl typically around 0.1M
  • strong acids can damage or even dissolve the nanoparticle surface, which results in reduced luminescence efficiencies.
  • an object of the invention to provide method for removing organic ligands from a luminescent material, preferably in the form of nanoparticles, which does not or minimizes damage to the particles and which is less selective, i.e. can be applied to a wide variety of luminescent materials and organic ligands.
  • the invention provides a method for treating a luminescent material comprising organic ligands, said method comprising contacting said luminescent material with an oxidizing agent.
  • Oxidation of the organic ligands has been found to result in their effective removal from the luminescent material. Without wishing to be bound by any scientific theory it is believed that the oxidation breaks down the organic ligands enabling the residues to dissolve.
  • the efficient removal of organic ligands enables to obtain particles which are in close proximity with one another. This is particularly advantageous if it is desired obtain a material which allows non-radiative energy transfer (FRET) from a sensitizer material to a light emitting material.
  • FRET non-radiative energy transfer
  • Luminescent material comprising organic ligands
  • the luminescent material comprising organic ligands is not limited to a particular luminescent material having organic ligands attached to its surface.
  • ligands can also be referred to as capping molecules (or a capping agent).
  • organic ligands are generally used to control growth and to avoid clustering of particles, in particular of nanoparticles.
  • the organic ligands may be any organic ligands suitable for this purpose.
  • organic ligands include fatty acids (including salts and esters thereof), amines, polyols, for instance oleic acid, oleyl amine, oleate, tributylamine and (poly) ethylene glycol.
  • the luminescent material is provided in the form of nanoparticles.
  • Any suitable nanoparticles may be used.
  • Suitable nanoparticles include particles of which at least one dimension is at a nanometer scale, preferably ⁇ 100 nm. More preferably, the D50 of the nanoparticle diameter is ⁇ 1nm and ⁇ 50 nm, most preferably ⁇ 2nm and ⁇ 10 nm.
  • the D50 may suitably be determined using transmission electron microscopy (TEM).
  • the luminescent material may comprise a host lattice which may be doped with ions.
  • the host lattice may for instance be selected from the group consisting of oxides, fluorides, nitrides, borates, garnets, molybdates, phosphates, vanadates, chlorides, sulfides, selenides, silicates, aluminates, oxyfluorides, fluorosilicates, oxychlorides, oxynitrides, oxysulfides, oxyselenides, fluorochlorides, and fluorobromides or combinations of these or another inorganic host material in which optically active lanthanide ions can be incorporated.
  • the host lattice is an oxide, garnet, phosphate, vanadate or combination of these such as Y 2 O 3 , YVPO 4 , YVO 4 or LaPO 4 or Y 3 Al 5 O 12 (“YAG”) or Lu 3 Al 5 O 12 (“LuAG”).
  • optically active (e.g. luminescent) ion may be used.
  • the host lattice may for instance be doped with one or more ions selected from the group consisting of Eu 3+ , Tb 3+ , Mn 4+ , Eu 2+ , Pb 2+ , Bi 3+ and Ce 3+ , preferably Ce 3+ or Eu 3+ , Mn 4+ and Tb 3+ , most preferably Eu 3+ or Ce 3+ .
  • the luminescent material is a material disclosed herein below as first luminescent material and/or second luminescent material.
  • the method according to the invention comprises contacting the luminescent material comprising the organic ligands with an oxidizing agent.
  • Any suitable oxidizing agent may be used.
  • Suitable oxidation agents may include any compound or combination of compounds, preferably in a solution, capable of oxidizing at least part of the organic ligands.
  • the oxidation agent is selected such that it is capable of oxidizing carbon present in the carbon chain of the organic ligands.
  • the oxidizing agent has a standard reduction potential > 1 Volt.
  • the oxidizing agent may for example be selected from the group consisting of an inorganic peroxide (preferably H 2 O 2 ), Fenton's reagent, nitric acid (HNO 3 ) and nitrate compounds, sulfuric acid (H 2 SO 4 ), peroxydisulfuric acid (H 2 S 2 O 8 ), peroxymonosulfuric acid (H 2 SO 5 ), chlorite, chlorate, perchlorate, and other analogous halogen compounds, Fluorine (F 2 ), chlorine (Cl 2 ), and other halogens, hypochlorite and other hypohalite compounds, hexavalent chromium compounds such as chromic and dichromic acids and chromium trioxide, pyridinium chlorochromate (PCC), and chromate/dichromate compounds, permanganate compounds such as potassium permanganate, sodium perborate, nitrous oxide (N 2 O), nitrogen dioxide/dinitrogen tetroxide (NO 2 / N 2
  • the oxidizing agent comprises H 2 O 2 .
  • the oxidizing agent comprises H 2 O 2 in combination with NH 4 OH or H 2 SO 4 , more preferably H 2 O 2 in combination with NH 4 OH.
  • the oxidation agent is present in a solution, preferably an aqueous solution.
  • the luminescent material comprising organic ligands may be contacted with the oxidizing agent in any suitable manner.
  • the luminescent material comprising organic ligands is contacted with the oxidizing agent in the presence of a solution comprising the oxidizing agent.
  • the solution comprises water or an alcohol (preferably methanol or ethanol) or a mixture thereof.
  • the solution comprises NH 4 OH, more preferably the solution comprises NH 4 OH and H 2 O 2 .
  • the solution comprises NH 4 OH and H 2 O 2 in a weight ratio between 8 : 1 and 2 : 1 most preferably in a weight ratio of about 3:1.
  • the solution comprising NH 4 OH and H 2 O 2 is at a temperature of between 60 and 90 °C, preferably about 70 °C.
  • the luminescent material comprising the organic ligands preferably luminescent material in the form of nanoparticles
  • a first solution for instance in water or an alcohol (e.g. methanol or ethanol) or a mixture thereof.
  • the first solution may then be combined with the oxidizing agent and/or with a solution comprising the oxidizing agent.
  • the oxidizing agent and/or a solution containing the oxidizing agent may be added to the first solution containing the luminescent material.
  • Contacting the luminescent material comprising the organic ligands with the oxidizing agent may be performed at any suitable temperature and during any suitable period. The skilled person is able to determine optimal conditions. In a preferred embodiment, in particular if the oxidizing agent is H 2 O 2 which is present in a NH 4 OH solution, contacting the luminescent material comprising the organic ligands with the oxidizing agent may for instance be effected for 15-120 minutes.
  • the method may comprising separating said luminescent material from the oxidizing agent.
  • the method comprises recovering the luminescent material from the solution. This may be achieved in any suitable manner.
  • recovering the luminescent material from the solution comprises gravity separation (preferably centrifugation) and/or drying by evaporation.
  • recovering the luminescent material from the solution comprises washing the luminescent material using a washing liquid and recovering the luminescent material from the washing liquid.
  • recovering the luminescent material from the washing liquid comprises gravity separation (preferably by centrifugation) and/or drying by evaporation.
  • recovering the luminescent material from the solution and/or from the washing liquid comprises at least drying by evaporation. Drying by evaporation may be performed in any suitable manner, for instance in an oven and/or under vacuum.
  • the method according to the invention comprises:
  • Mixtures comprising a first luminescent material and a second luminescent material
  • the luminescent material comprising organic ligands is a mixture comprising at least a first luminescent material and a second luminescent material, wherein the first luminescent material and/or the second luminescent material comprise organic ligands.
  • the first luminescent material and the second luminescent material comprise organic ligands.
  • the mixture comprising at least a first luminescent material and a second luminescent material is contacted with the oxidizing agent.
  • This enables to obtain a luminescent material in which the first luminescent material and second luminescent material are present in close proximity.
  • Such close proximity is particularly advantageous if it is desired to obtain a material which allows energy transfer (FRET) from the second luminescent material (or sensitizer material) to the first luminescent material (light emitting material).
  • FRET energy transfer
  • the first luminescent material and/or second luminescent material are provided in the form of nanoparticles. More preferably, the first luminescent material and second luminescent material are provided in the form of nanoparticles.
  • the first luminescent material and the second luminescent material are selected such that the second luminescent material has an emission spectrum which overlaps at least partly with one or more of excitation bands of the first luminescent material.
  • FRET energy transfer
  • the first luminescent material is a red emitting material.
  • the term red emitting material refers to a material which, upon suitable excitation, has one or more emission bands between 600 nm and 700 nm.
  • the first luminescent material is a material having, upon suitable excitation, one or more emission bands between 700 and 1400 nm (IR-A), between 580 and 600 nm (amber and/or orange), between 560 and 580 nm (yellow), between 510-560 nm (green), between 480 and 510 nm (cyan), between 440 and 480 nm (blue), between 400-440 nm (violet), between 315-400 nm (UV-A), or between 280-315 nm (UV-B).
  • the first luminescent material is doped with one or more ions selected from the group consisting of Eu 3+ , Tb 3+ , Mn 4+ . Especially preferred is Eu 3+ or Tb 3+ .
  • the first luminescent material and second luminescent material may have any suitable host lattice.
  • the host lattice may for instance be selected from the group consisting of oxides, fluorides, nitrides, borates, garnets, molybdates, phosphates, vanadates, chlorides, sulfides, selenides, silicates, aluminates, oxyfluorides, oxychlorides, oxynitrides, oxysulfides, oxyselenides, fluorochlorides, fluorosilicates and fluorobromides or combinations of these or another inorganic host material in which the optically active lanthanide ions can be incorporated.
  • the host lattice of the first luminescent material is an oxide, phosphate, vanadate or a combination thereof, for instance Y 2 O 3 , YVPO 4 , YVO 4 or LaPO 4 .
  • said preferred host lattice of the first luminescent material is doped with one or more ions selected from the group consisting of Eu 3+ and Tb 3+ .
  • the first luminescent material may for example have a host lattice doped at a doping level of 2-30% Eu 3+ , more preferably 5-15% Eu 3+ .
  • the first luminescent material may have a host lattice doped at a doping level of 5-100% Tb 3+ , more preferably 20-50% Eu 3+ .
  • the first luminescent material is selected from the group consisting of (Ca,Sr)Ga2O6:Eu3+ (or Tb3+), (Ca,Sr,Ba)La2Bi2(SiO4)3O:Eu3+ (or Tb3+), (Ca,Sr,Ba)SnO3:Eu3+ (or Tb3+), (Ca,Y,Gd)MoO4:Eu3+ (or Tb3+), (Y,Gd)BO3 (pseudo-vaterite):Eu3+ (or Tb3+), (Y,Tb)SiO5:Eu3+ (or Tb3+), A-La2O3:Eu3+ (or Tb3+), Ba2(SiO4):O2-:Eu3+ (or Tb3+), Ba2MgSi2O7:Eu3+ (or Tb3+), Ba2Y(BO3)2Cl:E
  • the second luminescent material is selected from the group consisting of (Sr n ,Ca 1-n ) 10 (PO 4 ) 6 *B 2 O 3 :Eu 2+ (wherein 0 ⁇ n ⁇ 1), (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,Br,OH):Eu 2+ ,Mn 2+ , (Ba,Sr,Ca)BPO 5 :Eu 2+ ,Mn 2+ ,Sr 2 Si 3 O 8 *2SrCl 2 :Eu 2+ , (Ca,Sr,Ba) 3 MgSi 2 O 8 :Eu 2+ ,Mn 2+ ,BaAl 8 O 13 :Eu 2+ , 2SrO*0.84P 2 O 5 *0.16B 2 O 3 :Eu 2+ , (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ,
  • the second luminescent material is excitable in the wavelength range between 380 to 580 nm.
  • the second luminescent material may for instance be excitable in the UV-A (315 to 400 nm), violet (400 to 440 nm), blue (440 to 480 nm) or green (510 to 560 nm) wavelength range, preferably in the blue (440 to 480 nm) wavelength range.
  • the second luminescent material is doped with one or more ions selected from of the group consisting of Eu 2+ , Pb 2+ , Bi 3+ and Ce 3+ , more preferably Ce 3+ and Eu 2+ .
  • the second luminescent material is a Ce 3+ -doped garnet, such as Y 3 Al 5 O 12 :Ce 3+ (“YAG:Ce”) or Lu 3 Al 5 O 12 :Ce 3+ (“LuAG:Ce”) or a combination thereof.
  • YAG:Ce YAG:Ce
  • Lu 3 Al 5 O 12 :Ce 3+ LuAG:Ce
  • the second luminescent material has a host lattice doped at a level of 0.05-5%, more preferably 0.1-4.
  • the mixture may comprise further luminescent materials.
  • the mixture may comprise at least two emitting materials and/or at least two sensitizer materials.
  • the mixture comprises first emitting material having a host lattice doped with Eu 3+ ions; and a second emitting material having a host lattice doped with Tb 3+ ions.
  • the mixture may comprise a first sensitizer material and a second sensitizer material. The first sensitizer material and second sensitizer material may be so arranged to each other to allow energy transfer from the first sensitizer material to the first emitting material and/or from the second sensitizer material to the second emitting material.
  • first luminescent material light emitting material
  • second luminescent material sensitizer material
  • co-doping with a second active ion can be used to enhance energy migration.
  • FRET FRET can occur between the first and second active ion within the same host lattice in order to have effective migration of the energy.
  • YAG:Ce 3+ , LuAG:Ce 3+ or a combination of these two materials are doped with ⁇ 5% Ce 3+ and co-doped with up to several 10's of percent Tb 3+ . Energy migration might be beneficial for smaller particles as well, as well as helpful for the emitter particles.
  • the invention further relates to a luminescent material obtainable by the method according to the invention.
  • a luminescent material obtainable by the invention allows detectable energy transfer (FRET) from the second luminescent material (or sensitizer material) to the first luminescent material (light emitting material).
  • FRET detectable energy transfer
  • non-radiative energy transfer (sometimes also referred to as Fluorescent Resonance Energy Tranfer, FRET) from the second luminescent material (or sensitizer material) to the first luminescent material (or light emitting material) involves the non-radiative energy transfer of energy from an excited sensitizer ion in the second luminescent material to an acceptor (or emitter) ion in the first luminescent material. It is evidenced and detectable by increased selective excitation of the sensitizer ion in the second luminescent material, resulting in increased emission from an emitter ion in the first luminescent material.
  • FRET Fluorescent Resonance Energy Tranfer
  • the invention further relates to a light-emitting device comprising the luminescent material obtainable by the method according to the invention.
  • the light-emitting device further comprises an excitation source for the luminescent material, such as for the second luminescent material.
  • the excitation sources is a UV-A, violet or blue light emitting material which emits light towards the luminescent material with a wavelength of 315-400 nm (UV-A), 400-440 nm (violet) or 440-480 nm (blue), more preferably between 430-465 nm.
  • the invention further relates to a lighting system comprising a light emitting device according to the invention.
  • the lighting system is selected from the group consisting of a lamp or luminaire, office lighting systems, household application systems shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, and decorative lighting systems, portable systems, automotive applications and green house lighting systems.
  • LaPO 4 :Eu 3+ (5%) + LaPO 4 :Tb 3+ (40%) nanoparticles with tributylamine ligands were synthesized using the following (known in literature) procedure:
  • a typical recipe for the preparation of La 1-x Ln x PO 4 nanoparticles in a high boiling coordinating solvent is as follows:

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)
EP18194532.0A 2018-09-14 2018-09-14 Procédé pour traiter une matière luminescente comprenant des ligands organiques Withdrawn EP3623448A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18194532.0A EP3623448A1 (fr) 2018-09-14 2018-09-14 Procédé pour traiter une matière luminescente comprenant des ligands organiques
PCT/EP2019/074572 WO2020053429A2 (fr) 2018-09-14 2019-09-13 Procédé de traitement d'un matériau luminescent comprenant des ligands organiques
EP19769149.6A EP3850058A2 (fr) 2018-09-14 2019-09-13 Procédé de traitement d'un matériau luminescent comprenant des ligands organiques

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EP18194532.0A EP3623448A1 (fr) 2018-09-14 2018-09-14 Procédé pour traiter une matière luminescente comprenant des ligands organiques

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Cited By (4)

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CN112642456A (zh) * 2020-12-11 2021-04-13 内蒙古科技大学包头师范学院 一种复合光催化剂的制备方法
CN113035480A (zh) * 2021-02-26 2021-06-25 中国科学院江西稀土研究院 一种磁制冷材料及其制备方法和应用
CN116904195A (zh) * 2023-06-26 2023-10-20 武汉工程大学 一种三掺杂硅酸盐荧光粉材料及其制备方法和应用
CN117363352A (zh) * 2023-12-08 2024-01-09 西安建筑科技大学 一种用于信息储存的荧光粉及其制备方法

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EP3255119A1 (fr) * 2015-02-02 2017-12-13 Stanley Electric Co., Ltd. Procédé de fabrication d'un point quantique et point quantique

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112642456A (zh) * 2020-12-11 2021-04-13 内蒙古科技大学包头师范学院 一种复合光催化剂的制备方法
CN113035480A (zh) * 2021-02-26 2021-06-25 中国科学院江西稀土研究院 一种磁制冷材料及其制备方法和应用
CN116904195A (zh) * 2023-06-26 2023-10-20 武汉工程大学 一种三掺杂硅酸盐荧光粉材料及其制备方法和应用
CN116904195B (zh) * 2023-06-26 2024-05-28 武汉工程大学 一种三掺杂硅酸盐荧光粉材料及其制备方法和应用
CN117363352A (zh) * 2023-12-08 2024-01-09 西安建筑科技大学 一种用于信息储存的荧光粉及其制备方法
CN117363352B (zh) * 2023-12-08 2024-03-08 西安建筑科技大学 一种用于信息储存的荧光粉及其制备方法

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